Tube-mill liner.



G. H. KIRSCH.

TUBE MILL LINER. APPLIOATION FILED Amma, 1909.

1,002,406. Patented; sept. 5, 1911.

COLUMBIA PLANDGRAPH o.. WASHINGTON. n. c

UNITED sTATEs PATENT oEEicE.

GEORGE HANS KIRSCI-I, 0E GERMISTON, TRANSVAAL.

TUBE-MILL LINER.

To all whom it may concern:

Be it known that I, GEORGE HANS Krnsorr, resident engineer, a citizen of the United States of America, residing at Knights Deep, Germiston, Transvaal, have invented new and useful Improvements in Tube-Mill Liners, of which the following is a specification.

This invention relates to tube mill linersr of that type in which provision is made for the automatic packing of a layer of the charge into appropriate recesses on the inner surface of the mill.

According to this invention, the recesses are formed as channels disposed circumferentially or substantially so, whereby the pebbles or other matter lodging in them form, when closely packed, an arch structure. There may be plurality of separate recesses lying in the plane of rotation, or the recesses may be helically disposed and pitched to any angle at which the arch formation is substantially retained.

Referring to the accompanying drawings, Figure I is a sectional plan of a tube mill fitted with one form of the invention, Fig. II a similar view of a modification, Fig. III is a transverse section of Fig. I, Figs. IV-VI are detail views showing alternative methods of securing the segments hereafter referred to, and Figs. VII-XI are detail views showing various constructions of the channels.

In the drawings, l indicates the shell of the mill. The channels 2, according to the modification shown in Figs. I and III are formed of sectioned segments 3, each curved to form a complete circle, or a part thereof, fitting and covering the interior of the mill. All such segments are fitted closely together so that their upstanding webs 4f form ithe walls and their horizontal webs 5 the bottom of the channels 2.

According to the modification shown in Fig. II the channels 2 form a continuous helix or a series of helices pitched to any angle of which the arch formation of the packed charge is substantially retained. Such helical channels may be constructed of continuous lengths of angle iron or steel or of segmental lengths thereof as in the first described example.

The segments or lengths may be secured in place in a variety of ways. Thus as shown in Figs. I-IV the ends of the up- Specification of Letters Patent.

Application led April 28, 1909.

Patented Sept. 5, 1911.

Serial No. 492,684.

standing webs 4 of the segments are cut 0E and a rail or bar 6 is placed over the eX- posed ends 7 of the horizontal webs 5 thus locking the segments. The bar itself is held in place by means of the end plate liners 8; it may also be bolted through the shell of the mill by bolts 9 (Fig. I). Again in Figs. V and VI the ends of the segments are wedged apartby wedges 10, thereby securing the segments frictionally to the shell. Instead of actual wedges the ends of the segments may be similarly forced apart by calking lead or like material between them; this method enabling a single segment to be removed readily without disturbing the adjoining ones, by simply cutting out the calking material.

The attrition to which the pebbles or'frag ments of the grinding charge are subjected in passing through the mill sometimes leads to those at a particular part of the mill being on an average smaller than those at other points and to insure such smaller pebbles or fragments packing properly, the channels may be varied in width at diiferent points in the length of the mill. For eX- ample they may be made of decreasing widths from the feed end l1 to the discharge end 12 of the mill, as indicated in Fig. I.

In operation, the fragments of the mill charge, whether pebbles specially introduced for grinding other matter, or the large parts of the material to be ground, lodge within the channels 2, thus forming a series of rough arches as seen in Figs. I and III. Such packed material projects mo-re or less yabove the channels and forms a surface upon which the remainder of the charge slides or rolls.

Instead of the segments being of angle section, as just described, they may be of any other section adapted to form the channels 2. Thus Fig. VII T-section may be used, or as shown in Fig. VIII channel section; these views also showing the upstanding webs of tapered form which gives rise to an inwardly flaring channel in which the charge wedges. Again the channels may be made of somewhat dovetail form by using rail y.sections Fig. IX or triangular ribs 13, Fig.

X, separated by plates 14. In a further modification, Fig. XI, cast segments, each containing a portion of a number of the channels, are employed, such channels being of any desired cross section.

What I Claim and desire to secure by Letters Patent is 1. Tube mill lining means, including curved metallic segments placed more or less oireumferentially Within the mill to form channels, a bar placed over the free ends of said segments to klook them in the mill and end plate liners retaining said bar in position.

2. A tube mill lining comprising a plurality of channel like structures circumferentially disposed in the tube and into which the charge is permitted to pack, and means dividing said structure to subdivide the packed charge into a plurality of arches and engaging said structure to hold the same in place in the tube.

In testimony whereof I afix my signature in presence of two Witnesses.

GEORGE HANS KIRSCH. Witnesses:

ALFRED L. SPooR, WESLEY E. JOHN.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

